Generate unique semi random numeric strings

Question

I want to generate 10k of unique numbers composed of a sequential number (16 digits) followed by a random numeric string (4 digits). Weapon of choice is Powershell because it's the only tool I have a very limited knowledge of.

Problems encountered:

1. Generating 10k sequential numbers using the following method: 1400000000000000..1400000000010000 and putting into a variable. Error: Value is to large for an Int32
2. Generating 10k of 4 digit via Get-Random -Minimum 0001 -Maximum 9999 and putting them in a variable. I manage only to obtain 1 random number.
3. Combining the two variables using the Join-Object (or at least that's what I hope could be done)

How can I combine these 3 commands to obtain a list of semi random numbers as specified above? Or is there simpler way to achieve the same result?

Answer 1

(0..10000).ForEach{ '14000000000{0:00000}{1:0000}' -f $_, (Get-Random 10000) }

Result:

14000000000000004965
14000000000000010114
14000000000000026382
14000000000000038644
14000000000000045435
14000000000000052051
14000000000000061801
14000000000000077046
14000000000000087791
14000000000000098090
14000000000000102712
....

Explanation:

• Use the Format Operator (-f) to format the string, like '14000000000{0:00000}{1:0000}'. For details, see composite formatting.
• You do not have to put the whole 16 digit number in a [int32], just count from 0..1000 with leading zeros up to 5 digits ({0:00000}) and prefix it with 14000000000
• In the second place holder ({1:0000}), place a new random number with leading zeros up to 4 digits